xref: /openbmc/qemu/scripts/qemu-binfmt-conf.sh (revision 0dacec87) 
1#!/bin/sh
2# enable automatic i386/ARM/M68K/MIPS/SPARC/PPC/s390/HPPA/Xtensa
3# program execution by the kernel
4
5qemu_target_list="i386 i486 alpha arm armeb sparc32plus ppc ppc64 ppc64le m68k \
6mips mipsel mipsn32 mipsn32el mips64 mips64el \
7sh4 sh4eb s390x aarch64 aarch64_be hppa riscv32 riscv64 xtensa xtensaeb"
8
9i386_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00'
10i386_mask='\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
11i386_family=i386
12
13i486_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x00'
14i486_mask='\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
15i486_family=i386
16
17alpha_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x26\x90'
18alpha_mask='\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
19alpha_family=alpha
20
21arm_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00'
22arm_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
23arm_family=arm
24
25armeb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28'
26armeb_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
27armeb_family=armeb
28
29sparc_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02'
30sparc_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
31sparc_family=sparc
32
33sparc32plus_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x12'
34sparc32plus_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
35sparc32plus_family=sparc
36
37ppc_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x14'
38ppc_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
39ppc_family=ppc
40
41ppc64_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15'
42ppc64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
43ppc64_family=ppc
44
45ppc64le_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15\x00'
46ppc64le_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\x00'
47ppc64le_family=ppcle
48
49m68k_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x04'
50m68k_mask='\xff\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
51m68k_family=m68k
52
53# FIXME: We could use the other endianness on a MIPS host.
54
55mips_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
56mips_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
57mips_family=mips
58
59mipsel_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
60mipsel_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
61mipsel_family=mips
62
63mipsn32_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
64mipsn32_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
65mipsn32_family=mips
66
67mipsn32el_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
68mipsn32el_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
69mipsn32el_family=mips
70
71mips64_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
72mips64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
73mips64_family=mips
74
75mips64el_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
76mips64el_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
77mips64el_family=mips
78
79sh4_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a\x00'
80sh4_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
81sh4_family=sh4
82
83sh4eb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a'
84sh4eb_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
85sh4eb_family=sh4
86
87s390x_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x16'
88s390x_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
89s390x_family=s390x
90
91aarch64_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00'
92aarch64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
93aarch64_family=arm
94
95aarch64_be_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7'
96aarch64_be_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
97aarch64_be_family=armeb
98
99hppa_magic='\x7f\x45\x4c\x46\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x0f'
100hppa_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
101hppa_family=hppa
102
103riscv32_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xf3\x00'
104riscv32_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
105riscv32_family=riscv
106
107riscv64_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xf3\x00'
108riscv64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
109riscv64_family=riscv
110
111xtensa_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x5e\x00'
112xtensa_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
113xtensa_family=xtensa
114
115xtensaeb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x5e'
116xtensaeb_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
117xtensaeb_family=xtensaeb
118
119qemu_get_family() {
120    cpu=${HOST_ARCH:-$(uname -m)}
121    case "$cpu" in
122    amd64|i386|i486|i586|i686|i86pc|BePC|x86_64)
123        echo "i386"
124        ;;
125    mips*)
126        echo "mips"
127        ;;
128    "Power Macintosh"|ppc64|powerpc|ppc)
129        echo "ppc"
130        ;;
131    ppc64el|ppc64le)
132        echo "ppcle"
133        ;;
134    arm|armel|armhf|arm64|armv[4-9]*l|aarch64)
135        echo "arm"
136        ;;
137    armeb|armv[4-9]*b|aarch64_be)
138        echo "armeb"
139        ;;
140    sparc*)
141        echo "sparc"
142        ;;
143    riscv*)
144        echo "riscv"
145        ;;
146    *)
147        echo "$cpu"
148        ;;
149    esac
150}
151
152usage() {
153    cat <<EOF
154Usage: qemu-binfmt-conf.sh [--qemu-path PATH][--debian][--systemd CPU]
155                           [--help][--credential yes|no][--exportdir PATH]
156
157       Configure binfmt_misc to use qemu interpreter
158
159       --help:       display this usage
160       --qemu-path:  set path to qemu interpreter ($QEMU_PATH)
161       --debian:     don't write into /proc,
162                     instead generate update-binfmts templates
163       --systemd:    don't write into /proc,
164                     instead generate file for systemd-binfmt.service
165                     for the given CPU. If CPU is "ALL", generate a
166                     file for all known cpus
167       --exportdir:  define where to write configuration files
168                     (default: $SYSTEMDDIR or $DEBIANDIR)
169       --credential: if yes, credential and security tokens are
170                     calculated according to the binary to interpret
171
172    To import templates with update-binfmts, use :
173
174        sudo update-binfmts --importdir ${EXPORTDIR:-$DEBIANDIR} --import qemu-CPU
175
176    To remove interpreter, use :
177
178        sudo update-binfmts --package qemu-CPU --remove qemu-CPU $QEMU_PATH
179
180    With systemd, binfmt files are loaded by systemd-binfmt.service
181
182    The environment variable HOST_ARCH allows to override 'uname' to generate
183    configuration files for a different architecture than the current one.
184
185    where CPU is one of:
186
187        $qemu_target_list
188
189EOF
190}
191
192qemu_check_access() {
193    if [ ! -w "$1" ] ; then
194        echo "ERROR: cannot write to $1" 1>&2
195        exit 1
196    fi
197}
198
199qemu_check_bintfmt_misc() {
200    # load the binfmt_misc module
201    if [ ! -d /proc/sys/fs/binfmt_misc ]; then
202      if ! /sbin/modprobe binfmt_misc ; then
203          exit 1
204      fi
205    fi
206    if [ ! -f /proc/sys/fs/binfmt_misc/register ]; then
207      if ! mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc ; then
208          exit 1
209      fi
210    fi
211
212    qemu_check_access /proc/sys/fs/binfmt_misc/register
213}
214
215installed_dpkg() {
216    dpkg --status "$1" > /dev/null 2>&1
217}
218
219qemu_check_debian() {
220    if [ ! -e /etc/debian_version ] ; then
221        echo "WARNING: your system is not a Debian based distro" 1>&2
222    elif ! installed_dpkg binfmt-support ; then
223        echo "WARNING: package binfmt-support is needed" 1>&2
224    fi
225    qemu_check_access "$EXPORTDIR"
226}
227
228qemu_check_systemd() {
229    if ! systemctl -q is-enabled systemd-binfmt.service ; then
230        echo "WARNING: systemd-binfmt.service is missing or disabled" 1>&2
231    fi
232    qemu_check_access "$EXPORTDIR"
233}
234
235qemu_generate_register() {
236    echo ":qemu-$cpu:M::$magic:$mask:$qemu:$FLAGS"
237}
238
239qemu_register_interpreter() {
240    echo "Setting $qemu as binfmt interpreter for $cpu"
241    qemu_generate_register > /proc/sys/fs/binfmt_misc/register
242}
243
244qemu_generate_systemd() {
245    echo "Setting $qemu as binfmt interpreter for $cpu for systemd-binfmt.service"
246    qemu_generate_register > "$EXPORTDIR/qemu-$cpu.conf"
247}
248
249qemu_generate_debian() {
250    cat > "$EXPORTDIR/qemu-$cpu" <<EOF
251package qemu-$cpu
252interpreter $qemu
253magic $magic
254mask $mask
255EOF
256    if [ "$FLAGS" = "OC" ] ; then
257        echo "credentials yes" >> "$EXPORTDIR/qemu-$cpu"
258    fi
259}
260
261qemu_set_binfmts() {
262    # probe cpu type
263    host_family=$(qemu_get_family)
264
265    # register the interpreter for each cpu except for the native one
266
267    for cpu in ${qemu_target_list} ; do
268        magic=$(eval echo \$${cpu}_magic)
269        mask=$(eval echo \$${cpu}_mask)
270        family=$(eval echo \$${cpu}_family)
271
272        if [ "$magic" = "" ] || [ "$mask" = "" ] || [ "$family" = "" ] ; then
273            echo "INTERNAL ERROR: unknown cpu $cpu" 1>&2
274            continue
275        fi
276
277        qemu="$QEMU_PATH/qemu-$cpu"
278        if [ "$cpu" = "i486" ] ; then
279            qemu="$QEMU_PATH/qemu-i386"
280        fi
281
282        if [ "$host_family" != "$family" ] ; then
283            $BINFMT_SET
284        fi
285    done
286}
287
288CHECK=qemu_check_bintfmt_misc
289BINFMT_SET=qemu_register_interpreter
290
291SYSTEMDDIR="/etc/binfmt.d"
292DEBIANDIR="/usr/share/binfmts"
293
294QEMU_PATH=/usr/local/bin
295FLAGS=""
296
297options=$(getopt -o ds:Q:e:hc: -l debian,systemd:,qemu-path:,exportdir:,help,credential: -- "$@")
298eval set -- "$options"
299
300while true ; do
301    case "$1" in
302    -d|--debian)
303        CHECK=qemu_check_debian
304        BINFMT_SET=qemu_generate_debian
305        EXPORTDIR=${EXPORTDIR:-$DEBIANDIR}
306        ;;
307    -s|--systemd)
308        CHECK=qemu_check_systemd
309        BINFMT_SET=qemu_generate_systemd
310        EXPORTDIR=${EXPORTDIR:-$SYSTEMDDIR}
311        shift
312        # check given cpu is in the supported CPU list
313        if [ "$1" != "ALL" ] ; then
314            for cpu in ${qemu_target_list} ; do
315                if [ "$cpu" = "$1" ] ; then
316                    break
317                fi
318            done
319
320            if [ "$cpu" = "$1" ] ; then
321                qemu_target_list="$1"
322            else
323                echo "ERROR: unknown CPU \"$1\"" 1>&2
324                usage
325                exit 1
326            fi
327        fi
328        ;;
329    -Q|--qemu-path)
330        shift
331        QEMU_PATH="$1"
332        ;;
333    -e|--exportdir)
334        shift
335        EXPORTDIR="$1"
336        ;;
337    -h|--help)
338        usage
339        exit 1
340        ;;
341    -c|--credential)
342        shift
343        if [ "$1" = "yes" ] ; then
344            FLAGS="OC"
345        else
346            FLAGS=""
347        fi
348        ;;
349    *)
350        break
351        ;;
352    esac
353    shift
354done
355
356$CHECK
357qemu_set_binfmts
358